Slim power failure light



FIG. 1 is a top, front and right side perspective view of a slim power failure light showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a rear elevational view thereof; and,

FIG. 7 is a right side elevational view thereof.

The portions shown in broken lines form no part of the claimed design. 

The ornamental design for a slim power failure light, as shown and described. 